禁用 iCloud 同步

问题描述

有没有办法阻止您的应用程序数据(文档文件夹内容)同步到 iCloud?(然后将其存储在 Caches 目录中，因为 iOS5 中的新问题是 那)我的应用程序需要在设备上存储数据，但出于安全原因，它不能同步到任何第 3 方(包括 Apple).

Is there a way to prevent your application data (Documents folder contents) from being synced to iCloud? (other then storing it in Caches directory because of the new issues in iOS5 with doing that) My Application has need of storing data on the device, but for security reasons it can't be synchronized to any 3rd party (including Apple).

推荐答案

来自:https://developer.apple.com/library/ios/#qa/qa1719/_index.html

您可以使用以下方法设置不备份"扩展属性.每当您创建不应备份的文件或文件夹时，将数据写入文件，然后调用此方法，将 URL 传递给文件.

You can use the following method to set the "do not back up" extended attribute. Whenever you create a file or folder that should not be backed up, write the data to the file and then call this method, passing in a URL to the file.

#include <sys/xattr.h>
- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL
{
    const char* filePath = [[URL path] fileSystemRepresentation];

    const char* attrName = "com.apple.MobileBackup";
    u_int8_t attrValue = 1;

    int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);
    return result == 0;
}

可以找到更多信息:https://developer.apple.com/icloud/documentation/data-存储/

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